Cita APA (7a ed.)

Arnold, S. J. (1972). Species densities of predators and their prey. [s.n.].

Cita Chicago Style (17a ed.)

Arnold, Stevan J. Species Densities of Predators and Their Prey. [S.l.]: [s.n.], 1972.

Cita MLA (9a ed.)

Arnold, Stevan J. Species Densities of Predators and Their Prey. [s.n.], 1972.